#test.pl

for (1..2) {
    eval "require bar";
    print "attempt $_: ", ($@ ? "nok - $@" : "ok"), "\n";
}

#bar.pm

use Carp;
croak "loaded$/"

# STDOUT:

attempt 1: nok - loaded
        require bar.pm called at (eval 1) line 3
        eval 'require bar
;' called at test.pl line 3
Compilation failed in require at (eval 1) line 3.

attempt 2: ok